A multiparameter thermal conductivity equation for R134a with an optimized functional form |
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| Affiliation: | 1. Univ. Grenoble Alpes, LGP2, F-38000 Grenoble, France;2. CNRS, LGP2, F-38000 Grenoble, France;3. Laboratoire Rhéologie et Procédés, Grenoble INP-CNRS-UJF, UMR 5520, BP 53, 38041 Grenoble Cedex 9, France;1. Institute of Industrial Catalysis, State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Chaowang Road 18, Hangzhou 310014, Zhejiang, PR China;2. State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum, Beijing, 18 Fuxue Road, Beijing 102249, PR China;1. NIRAS A/S, Sortemosevej 19, DK-3450 Allerød, Denmark;2. Department of Environmental Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark |
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| Abstract: | ![]()
A new multiparameter equation λ = λ(T, ρ) for the thermal conductivity of R134a has been developed from the available experimental data using a technique for the optimization of the functional form. The equation is valid in the temperature range from 200 to 540 K and for pressure up to 70 MPa, including also the near-critical region. The satisfactory performances of the equation are summarized by an average absolute deviation of 2.04% for the selected 5102 primary data points, with a significant improvement with respect to the present reference equation from the literature.The conversion of the independent variables of the experimental data into those of the equation, i.e. (T, P) into (T, ρ), is performed with a high accuracy equation of state for the fluid. |
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